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Mod | | | Forums66 Topics128,077 Posts1,055,928 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2010 Posts: 3 New Guy | | New Guy Joined: May 2010 Posts: 3 | I remember viewing a post a few years back regarding brake fluid loss through a vacuum cylinder seal. Anyway, I've finally retired and have time to pick up the wrenches and fix things (you should see my wife's honey-do list...). I searched for the post again but no luck. Anyone remember that post or better yet, can lend some pointers?
I'm new on the forums, but I'll post pics of "Oliver" soon.
Thanks!
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Beebolttz, welcome, please remember to tell us what year, size, and make of truck [Chev or GMC] you're asking questions about, that way you will get the most acurate answers. Hydrovacs have a large chamber that can collect a lot of brake fluid under the right/wrong conditions. | | | | | Joined: May 2010 Posts: 3 New Guy | | New Guy Joined: May 2010 Posts: 3 | Oops,
Yup I forgot the goods.
Chevy late '46 2 ton flatbed orchard truck.
Thanks!
Last edited by Beeboltz; 05/03/2011 3:39 AM.
| | | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | Hydrovacs have a large chamber that can collect a lot of brake fluid under the right/wrong conditions. bobb is right i found out how much fluid its not supposed to hold. remove the vacuum line on the hydrovac unit and if brake fluid comes out then its not vanishing no more. your unit needs overhauling or replacement. | | | | | Joined: Mar 2009 Posts: 93 Shop Shark | | Shop Shark Joined: Mar 2009 Posts: 93 | Yea my 1947's doing the same thing. I kept wondering where the brake fluid was going, found out the other day when I saw the vacuum lines to the hydro vac leaking something and it smelled like brake fluid.
Haven't tried to fix it yet. | | |
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